Pick for mining or cutting machines.



PATENTED APR. 30, 1907.

T. N. WALLACE. PICK FOR MINING 0R CUTTING MACHINES.

APPLICATION FILED AUG. 7, 1906.

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UNITED sing es PATENT oF IoE.

THOMAS N.'WALLACE, or CENTERVILLE, IOWA, ASSIGNOR or FIFTEEN oNE- HUNDREDTHS TO JOHN R. NEEDHAM, or GENTERVILLE, IOWA.

; PICK FOR MINING OR CUTTING MACHINES.

Specification of Letters Patent.

Patented April 30, 1907.

\ Application filed August '7, 1906- Serial No, 329.519.

To all whom it may cp/tcern:

Be it known that I, THOMAS N. 'WALLAGE, a citizen of the United States, residing at Centerville, in the county or Appanoose and State of Iowa, have invented certain new and useful Improvements in Picks for Mining or Cutting Machines, of. which the following is a specification, reference being had therein to the accompanying drawings.

This invention relates to improvements in mining or cutting machines, and particularly to the pick thereof.

The object of the invention is the novel construction of a pick for a mining or cutting machine, whereby the capacity of the same will be materially increased by the eflicient, as well as durable structure of the pick.

.With this and other objects in view, the invention consists of certain'novel constructions, combinations, and arrangements of parts, as will be hereinafter fully described and claimed.

In the drawings: Figure 1 is a view in side elevation of a pick constructed in accordance with my invention and showing the same in engagement with the plunger of the mining or cutting machine. Fig. 2 is a top plan view of the pick. Fig. 8 is a transverse, sectional view taken on line 3, 3, of'Fig. 1, and looking in the direction of the arrows.

The stem 1 of my pick is preferably positioned within sleeve 2 of the plunger 3 of a mining machine. Integral with the stem 1 are side-points 2 and a central-point 3. The side-points 2 are ositionecl in the same horizontal lane, Whi e the central-point 3 ispositione( out of the plane with the side-points 2, thereby placing said point 3 in a higheror lower position with respect to the inverted or upright position, respectively, in which the pick is resting.

The central-point 3 isprei'erablv of greater length than the side-points, and the outer endof point-3 is positioned beyond the outer ends of points 2.

Each side-point 2 is provided with an outer, fiat, vertical side and an inner, beveled side 4, Fig. 3." The central-point 3 is provided with a pair of beveled sides, thereby producing a substantially 'V-shaped point in cross-section. The .two side-points 2 are also substantially V-shaped in cross-section. ]t' is to be noted that all of the points have a 7 cutting edge 5 formed upon the same side of the pick, whereby a clean cut is made and the points always clear themselves.

A portionof the central and sideoints 2 are concaved, thereby-producing a ongitudinally extending groove 6 upon the bottom or one side of the pick. Among the advantages of this groove may be mentioned the fact that it prevents dirt or coal from clogging around the pick and also relieves friction as to dead space between the two sidepoin'ts 2.

The central-point 3 is a lead or performs the function of a. centering device, holding the pick in place, and keeps the'same from slipping and losing its power of stroke.

My pick may be used on a rotary machine.

It is operated preferably by a reciprocating plunger. It is to be noted that, while the central-point will not permit the pick to slip, it will also prevent the same from glancing away from its Work. Each point not only ta ers throughout its width from the back to't e cutting edges 5, but also tapers from the stem 1 throughout its length to the extreme forward end.

What I claim is: 1. Apick, comprising a stem, a pair of sidepoints integral therewith, and a centraloint integral with said stem and of greater ength than said side-points, said central and side-points provided with cutting edges upon one side thereof and a longitudinally extending groove formed upon the sides of said points opposite to said cutting edges.

2. A pick for mining or cutting machines, comprisin a stem, a central and side-points integral with said stem, the central point ofgreater length than said side-points, said sidepoints ositioned in the same horizontal plane, t e centraloint positioned in a difterent horizontal p ane from said side-points, said side and central-points provided with a longitudinally extending groove formedupon one side thereof, and upon their op osite sides said points tape! to longitudinal y extending cutting edges.

3. A pick, comprising a stem, a point'integral with said stem, said point su stantially V-shaped in cross-section and provided with a longitudinally-extending cutting edge, and

- said point rovided with a longitudinally-extending groove formed in the side opposite'to its cutting-edge. I

4. A pick, comprising -'a stem, a point se cured to said stern, said pointprovided with a tral point of greater length than the side points, and each point tapering from the stem throughout its entire length to its forward end.

6. As a new article of manufacture, a pick, comprising a stem provided with a central and side points, the. central point of greater length thanthe side points, and each point provided with a cutting edge upon the same side, and the cutting edges extending throughout the entire length of all of said points.

7. A mining pick, comprising a stem, a

each point tapering from a broad back downwardly to a longitudinally-extending cutting edge, and the central point of greater length than and positioned in ahorizontal plane be low the side points.

8; A pick, comprising a stern, a series of points integal with said stem, each'point tapering from a broad back to a lower cutting edge, the cutting edges of all of the points formed on the same side, and one of the points of greater length than the remaining points.

In testimony whereof I hereunto affix my signature in presence of two witnesses.

THOMAS N. \IVALLACE.

Witnesses A. H. EELLs, C. W. VERMILION. 

